EP0010027A1 - Verfahren zur Herstellung hydraulischer Zemente auf der Basis von Portlandklinkern und Calciumsulfat-Residuum - Google Patents

Verfahren zur Herstellung hydraulischer Zemente auf der Basis von Portlandklinkern und Calciumsulfat-Residuum Download PDF

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Publication number
EP0010027A1
EP0010027A1 EP79400664A EP79400664A EP0010027A1 EP 0010027 A1 EP0010027 A1 EP 0010027A1 EP 79400664 A EP79400664 A EP 79400664A EP 79400664 A EP79400664 A EP 79400664A EP 0010027 A1 EP0010027 A1 EP 0010027A1
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Prior art keywords
clinker
grinding
cement
calcium sulphate
residual calcium
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EP79400664A
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English (en)
French (fr)
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EP0010027B1 (de
Inventor
Jean-Noel Communal
Raymond Filhol
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Rhone Poulenc Chimie de Base SA
Original Assignee
Rhone Poulenc Industries SA
Rhone Poulenc Chimie de Base SA
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Application filed by Rhone Poulenc Industries SA, Rhone Poulenc Chimie de Base SA filed Critical Rhone Poulenc Industries SA
Priority to AT79400664T priority Critical patent/ATE814T1/de
Publication of EP0010027A1 publication Critical patent/EP0010027A1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements

Definitions

  • the present invention in which Messrs. Jean-No ⁇ l COMMUNAL and Raymond FILHOL participated, relates to a process for the manufacture of hydraulic cements based on Portland clinker and residual calcium sulphate. More particularly, it relates to the manufacture of a Portland type cement from Portland clinker and gypsum obtained as a by-product of the manufacture of phosphoric acid, hereinafter called phosphogypsum.
  • Cements are produced by calcination of suitable raw materials in general mixtures of limestone and clay so as to obtain a "clinker” which leads by grinding to artificial Portland cement.
  • This cement is mainly composed of tricalcium silicate (3 CaO, Si0 2 ), bicalcium silicate (2 CaO, SiO 2 ), tricalcium aluminate (3 CaO, Al 2 O 3 ) and tetracalcium aluminoferrite (4 CaO, Al 2 O 3 , Fe 2 O 3 ),
  • the tricalcium aluminate hydrates rapidly which causes disturbances in the overall setting of the material.
  • calcium sulphate is added to the clinker after cooling in the form of natural gypsum which plays the role of setting regulator by first transforming the tricalcium aluminate into ettringite or calcium trisulfoaluminate (3 CaO, Al 2 O 3 , 3 Ca SO 4 , 32 H 2 0) which then evolves towards calcium monosulfoaluminate (3 CaO, A1203, Ca SO 4 , 12 H 2 0 ).
  • clinker and natural gypsum are introduced into a grinding apparatus, in general, a ball mill and simultaneous grinding of clinker and natural gypsum is carried out until the mixture is finely divided with a surface. relatively large specific in order to obtain the cement in the finished state.
  • the residual gypsum was also purified by calcining it under normal pressure or under steam pressure in mixture with a compound such as, for example, an oxide, hydroxide or carbonate of calcium or magnesium, a cement, etc., then by subjecting the product thus obtained to hydration in order to obtain the calcium sulphate dihydrate (cf. American patent 3,159,497).
  • a compound such as, for example, an oxide, hydroxide or carbonate of calcium or magnesium, a cement, etc.
  • the first consists of introducing the clinker into a grinding device and carrying out its grinding until the state of fineness of the desired cement is obtained; optionally grinding the residual calcium sulphate separately, introducing the clinker and the residual calcium sulphate in a mixer and carrying out the mixing operation until a homogeneous mixture is obtained.
  • the other alternative embodiment comprises the following operations: the clinker is introduced into a grinding apparatus; grinding of the clinker alone is carried out for a fraction of the normal grinding time necessary to bring it to the fineness of the desired cement; the residual calcium sulphate is then introduced and the clinker and residual calcium sulphate are co-grinded for a limited period.
  • cement is meant the product resulting at least from the grinding of Portland clinker with the addition of calcium sulphate.
  • the duration of grinding the clinker depends on the state of fineness of the desired cement. Due to the small quantities of calcium sulfate involved which does not exceed 7% but more than 7% of the weight of clinker, it is considered that the cement has approximately the state of fineness of the clinker for a same grinding time.
  • the time interval between the introduction of the clinker into the grinding apparatus and the exit of the clinker in the fineness of the desired cement and by duration of co- grinding the time interval between the introduction of the residual calcium sulphate into the grinding apparatus already containing the clinker and the output of the cement in the desired state of fineness.
  • the setting times of the cement are minimum when a simple mixing of the clinker and calcium sulfate or co-grinding is carried out during a contact time adjusted to a fraction of the total time. grinding of the clinker.
  • Portland clinker As a raw material involved in the process of the invention, a Portland clinker is used.
  • Portland clinker we name (standard NF P. 15101) the product containing mainly calcium silicates, obtained by cooking until partial melting (clinkering) of a metered and homogenized mixture of materials mainly consisting of lime (CaO ), silica (SiO 2 ) and in lower proportions of alumina (Al 2 O 3 ) and iron oxide (Fe 2 O 3 ).
  • the clinkers commonly manufactured in the cement industry according to well known techniques.
  • the clinker may also contain other constituents in small amounts. Mention may in particular be made of magnesia, the content of which, expressed in, MgO does not exceed 5% by weight of the clinker, of alkalis K 2 O / Na 2 0, the content of which is of the order of 1%.
  • the analysis can also reveal the presence of SO 3 in the clinker in an amount not exceeding 1.5% of its weight.
  • the clinker is generally in the form of pieces of dimensions of the order of a centimeter (1 to 5 centimeters) which always requires grinding in order to bring it to the state of fineness of the cement.
  • residual calcium sulphate since it is a manufacturing by-product, it generally contains a certain number of impurities and the manufacture of the cement according to the process of the invention makes it possible to partially inhibit the delaying action of impurities and reducing the setting times of the cement.
  • any residual calcium sulphate can therefore be used, but in the case where the process of the invention would not make it possible to obtain acceptable setting times for cement which are comparable to those obtained by using the natural gypsum as setting regulator, it should be used in combination with other purification or chemical treatment operations, in particular alkaline residual calcium sulphate or with other physicochemical methods making it possible to reduce setting time in particular the addition of setting accelerators well known and widely described in the literature (Arnold J. FRANKLIN Cement and Mortar Additives 2nd edition Noyes Data Corporation New Jersey 1976).
  • the calcium sulphate thus involved in the present invention can be in different forms corresponding to different degrees of hydration.
  • acidic effluents can have various origins such as, for example, the industrial manufacture of titanium oxide by the sulfuric route, the pickling processes in the steel making, the refining processes, copper sulfates or zinc.
  • a phospho is used gypsum obtained as a by-product of the manufacture of phosphoric acid by attack using sulfuric acid from phosphate ores such as, for example, Morocco, Togo, Taiba, Brazil, Florida, Africa from the South, from Israel etc ...
  • non-crystallized impurities phosphoric acid, residual phosphate rock, calcium, iron, aluminum phosphates, fluorides, silico-fluorides and fluorinated complexes such as chukrovite, silica etc.
  • syncrystallized impurities bicalcium phosphate isotype of gypsum, alumino-fluorinated complex ions AIF 5 2- ..).
  • a phosphogypsum originating from the manufacture of phosphoric acid as described in French patents 1,125,849 and 1,181,150, or as it comes from the filtration of the attack liquid will be used.
  • phosphates for example by means of the filter described in French patent 1 327 693 either after having undergone a purification step and possibly a step of transformation of the impurities by chemical means such as for example, an alkaline treatment.
  • the purification step generally comprises a simple washing followed by filtration or a spin, or else a hydrocyclonage followed by a filtration or a spin, or else a flotation followed by a filtration or a spin .
  • hydrocycloning it is possible to operate as described in French patent 1 601 411.
  • the phosphogypsum can also be treated with a basic agent such as for example lime in order to bring it to a pH of approximately 9 to 12.
  • a basic agent such as for example lime in order to bring it to a pH of approximately 9 to 12.
  • the phosphogypsum used according to the process of the invention has a free water content of between 0 and 25% by weight of water but it is preferable for reasons of convenience of use, than the content of water does not exceed 10% by weight.
  • Any phosphaine of Blaine specific surface area varying from 1000 to 2000 cm 2 / g can be used for the practice of the invention, and such phosphogypsum which has undergone operations can also be used without disadvantage. Grinding up to 500, cm2 / g.
  • the phosphogypsum used for the purposes of the invention will be described, which is in the form of a powder having a specific Blaine surface of the order of 1500 cm 2 / z and an average particle diameter varying from 25 at 60 ⁇ is meant by mean diameter, a diameter such that 50% of the particles have a diameter greater or less than the mean diameter.
  • the phosphogypsum can be introduced into the manufacture of cements alone or in admixture with various plasters based on calcium sulphate semi-hydrate alpha (a) or based on calcium sulphate semi-hydrate beta ( ⁇ ), or finally with l 'anhydriteIII or II.
  • ex-phosphogypsum plaster can be used, in particular from the processes described above.
  • Various drying-calcination routes can be used to make plaster: among these we can cite, a continuous rotary oven with indirect heating, a cyclic discontinuous rotary oven with indirect heating, a screw calciner (cf. French patent 1 601 411) or pneumatic drying and calcination in a fluid bed (see French patent application 75/16119) or pneumatic type calcination carried out in an apparatus of the type described in French patent 2 257 326.
  • the phosphoplaster used can be used as obtained after calcination and then has a specific Blaine surface varying from 700 to 2500 cm2 / g or after having undergone grinding thus leading to specific Blaine surfaces from 2500 to 7000 cm2 / g.
  • the quantity of phosphoplaster added to the phosphogypsum is limited by the false cement setting and must be defined for each clinker. It must not exceed 80% of the weight of phosphogypsum.
  • a hydrated residual calcium sulphate is used as setting regulator and even more preferably it is chosen based on gypsum.
  • the quantity of residual calcium sulphate to be introduced into the clinker depends on the desired properties.
  • the percentage by weight of SO 3 in the cement obtained varies from 1 to 4% by weight.
  • the quantity of calcium sulphate added must be at most equal to that which would bring the sulfuric anhydride S0 3 content to the maximum rate of 4%.
  • the S0 3 contained in the clinker is assayed by chemical analysis and the amount of calcium sulphate to be added is adjusted so as to obtain the desired content of S0 3 in the cement.
  • grinding of the clinker alone is carried out, which can be carried out in the usual devices for this purpose, for example ball mills, a tube mill or a compound mill.
  • the total duration of the clinker grinding is such that the clinker is brought to the desired state of fineness which is approximately that of the cement to be obtained, the Blaine specific surface area of which varies from 1500 to 5000 cm 2 / g.
  • the calcium sulfate used can be sieved.
  • the clinker and the calcium sulphate are then introduced into a mixer which can be any device allowing a homogeneous mixture to be obtained without destroying the particle size.
  • a mixer which can be any device allowing a homogeneous mixture to be obtained without destroying the particle size.
  • One can cite, for example, the class of drum mixers.
  • the duration of the operation depends on the apparatus used as well as on the nature of the constituents to be mixed and can be easily determined by a person skilled in the art by the set of simple execution operations.
  • Another embodiment of the invention consists in introducing the clinker alone into an apparatus for grinding, in general, a ball mill.
  • the residual calcium sulphate is introduced at a time such that the duration of the co-grinding of the clinker and of the calcium sulphate is of limited duration.
  • the interval defining the duration of co-grinding has as upper limit a duration of co-grinding less than the duration of grinding necessary to bring the clinker to the state of fineness of the desired cement.
  • the lower limit is fixed by the time necessary to obtain a homogeneous mixture.
  • the invention can be translated as follows: at time t l : introduction of the clinker into the apparatus to be ground.
  • t 3 - t 1 represents the duration of the grinding of the clinker.
  • t 3 - t 2 represents the duration of the co-grinding of the clinker and of the residual calcium sulphate.
  • t 3 is a function of the fineness of the cement to be obtained. To simplify its evaluation, it is considered that the clinker and the cement have the same state of fineness insofar as the calcium sulphate is in the form of a fine powder.
  • the determination of t 2 is a function of the quality of the cement sought, in particular the desired setting time.
  • t3 is chosen in relation to the desired setting time for each clinker couple, residual calcium sulphate.
  • the mortar is made according to standard NF 15403.
  • the fluidity of the mortar is measured by spreading the mortar which has been previously molded in a trunk of cone with a base diameter of 8 cm, a diameter greater than 7 cm and a height of 4 cm.
  • the mortar is placed on a shock table which is subjected to 15 shocks at the rate of 1 shock per second; the shock is caused by a fall of 15 mm in height.
  • the spread is expressed in centimeters and corresponds to the average diameter of the wafer obtained after the 15 shocks.
  • the start of setting is the time after which a calibrated and charged needle (NF P 15.414) can no longer penetrate to the bottom of the container containing the pure paste, this is the Vicat test (NF. P 15.431).
  • test specimens of dimensions 4 ⁇ 4 ⁇ 16 cm, which are first kept for 24 hours in an enclosure at 20 ° C. and 100% relative humidity, then immersed in a tank filled with water thermostatically controlled at 20 ° C until the date of the test.
  • Tests A 1 , B1 and A 2 , B 2 are given as a control test and relate respectively to the preparation of a cement from clinker and natural gypsum according to the mixing techniques of the invention and co - total grinding.
  • Tests C to K show the characteristics of a cement obtained by using a residual calcium sulphate according to the known process of total co-grinding.
  • the percentage of SO 3 dosed in the clinker is 1.3%.
  • the pre-grinding of the clinker is carried out in a FORPLEX impact crusher (F. 00) (registered trademark) so that all the granules of the clinker pass through a sieve whose mesh openings are 4 millimeters.
  • FORPLEX impact crusher F. 00
  • F. 00 registered trademark
  • the calcium sulphate used is a natural gypsum of VICAT Montalieu origin, the chemical analysis of which is as follows:
  • the natural gypsum used In order to bring the natural gypsum to a Blaine specific surface comparable to that of the phosphogypsum, its grinding is carried out in the aforementioned FORPLEX mill: the natural gypsum used then has a Blaine specific surface of 1150 cm 2 / g.
  • a cement is obtained on which the mortar tests defined above are carried out.
  • Cement is prepared from the same constituents according to the traditional route of total co-grinding.
  • a co-grinding of the two components is carried out for a total duration of 1 h 30 min.
  • the preparation of a cement is carried out according to the conditions described in the previous test, except that the nature of the clinker is changed.
  • the percentage of SO 3 dosed in the clinker is 0.3%.
  • the clinker is pre-ground so that there is no particle retained on a sieve having a mesh opening of 4 millimeters.
  • the calcium sulphate used is natural gypsum, the composition of which is given in test A.
  • VICAT St EGREVE n ° 1 clinker 956 g of VICAT St EGREVE n ° 1 clinker are introduced into a PROLABO ball mill.
  • the clinker is crushed until a Blaine specific surface of 3200 cm 2 / g is obtained.
  • the natural gypsum is ground in order to bring it to a Blaine specific surface of 3500 cm 2 / g.
  • the co-grinding operation of the two components is carried out for a period of 1 h 30 min.
  • the phosphogypsum is dried but on an industrial scale, it is preferable to introduce it in wet form because in an industrial mill the temperature is such (80 ° -95 ° C) that the presence of water is favorable because it prevents its transformation into phosphoplaster.
  • a cement is prepared from the VICAT Montalieu n ° 4 clinker defined in the previous test and as calcium sulphate, a phosphogypsum resulting from the attack with sulfuric acid of a phosphate ore of MOROCCO origin and having undergone purification by hydrocycloning.
  • the phosphogypsum used has the following chemical composition:
  • a cement is obtained which has a Blaine specific surface of 3000 cm2 / g.
  • the clinker obtained has a Blaine specific surface of 3000 cm2 / g.
  • hydrocyclone phosphogypsum Since the hydrocyclone phosphogypsum has sufficient fineness, 961 g of clinker and 39 g of hydrocyclone phosphogypsum are mixed in a mixer of the RED-DEVIL type and for a period of 30 min.
  • a cement is obtained which has a Blaine specific surface of 2800 cm2 / g.
  • a cement is prepared according to the traditional technique of total co-grinding starting from the same raw materials described above.
  • the co-grinding of said components is carried out for a period of 1 h 15 min.
  • a cement is obtained having a Blaine specific surface of 3000 cm2 / g.
  • a cement is prepared from a clinker of Portland cement VICAT St EGREVE n ° 1 as described in test B.
  • the residual calcium sulphate used is the hydrocyclone phosphogypsum characterized in example 1.
  • the cement is prepared by mixing the clinker and the phosphogypsum after grinding the clinker separately.
  • VICAT St EGREVE n ° 1 clinker 1000 g are introduced and its grinding is carried out for a period of 1 h 45 min.
  • the clinker obtained has a Blaine specific surface of 3300 cm2 / g.
  • Cement having a Blaine specific surface of 3300 cm2 / g.
  • the VICAT St EGREVE n ° 1 clinker and the hydrocyclone phosphogypsum are co-crushed for a total duration of 1 h 30 min.
  • the cement obtained has a Blaine specific surface of 3400 cm2 / g.
  • the mixing of the clinker and the phosphogypsum is carried out for 30 minutes.
  • a comparative test is carried out starting from the same raw materials but carrying out simultaneous co-grinding of the clinker and of the phosphogypsum for 1 h 15 min.
  • a cement is prepared from the clinker referenced VICAT Montalieu n ° 4 defined in test A and from the same phosphogypsum as that of the previous example.
  • the phosphoplaster used results from the calcination of the same phosphogypsum.
  • Mixtures of phosphogypsum and phosphoplaster are produced containing increasing amounts of phosphoplaster 20, 50, 80% by weight of the mixture.
  • Cement is manufactured according to the mixing technique of the invention as described above and for comparison according to the traditional route.
  • the examples illustrate the use as a phosphogypsum setting regulator resulting from the attack with sulfuric acid of ores of various origin FLORIDE and TOGO.
  • a Portland cement clinker referenced VICAT Montalieu No. 5 which contains the four main oxides in the following proportions:
  • the percentage of SO 3 dosed in the clinker is 1.4%.
  • the invention applies to any binder requiring calcium sulphate to regularize its setting. Mention may more particularly be made of any Portland cement without secondary constituent or with secondary constituents such as slag, pozzolans or fly ash: any slag-based cement such as mixed metallurgical cements, blast furnace cements, clinker slag.
  • the most widely used hydraulic cement is Portland cement.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Disintegrating Or Milling (AREA)
EP79400664A 1978-10-10 1979-09-19 Verfahren zur Herstellung hydraulischer Zemente auf der Basis von Portlandklinkern und Calciumsulfat-Residuum Expired EP0010027B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400664T ATE814T1 (de) 1978-10-10 1979-09-19 Verfahren zur herstellung hydraulischer zemente auf der basis von portlandklinkern und calciumsulfat-residuum.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7829586A FR2438633A1 (fr) 1978-10-10 1978-10-10 Procede de fabrication de ciments hydrauliques a base de clinker portland et de sulfate de calcium residuaire
FR7829586 1978-10-10

Publications (2)

Publication Number Publication Date
EP0010027A1 true EP0010027A1 (de) 1980-04-16
EP0010027B1 EP0010027B1 (de) 1982-04-07

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EP79400664A Expired EP0010027B1 (de) 1978-10-10 1979-09-19 Verfahren zur Herstellung hydraulischer Zemente auf der Basis von Portlandklinkern und Calciumsulfat-Residuum

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EP (1) EP0010027B1 (de)
AT (1) ATE814T1 (de)
BR (1) BR7906504A (de)
DE (1) DE2962457D1 (de)
ES (1) ES484840A1 (de)
FR (1) FR2438633A1 (de)
GR (1) GR72527B (de)
MA (1) MA18608A1 (de)
ZA (1) ZA795389B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4335723A1 (de) * 1993-03-27 1994-09-29 Ruedersdorfer Zement Gmbh Verfahren und Vorrichtung zur Herstellung eines Bindemittels
DE19647484A1 (de) * 1996-11-16 1998-05-20 Deutz Ag Verfahren und Anlage zur Herstellung von Zement
RU2243945C2 (ru) * 2003-02-06 2005-01-10 Николин Владислав Аликович Способ получения безусадочного коррозиеустойчивого портландцементного вяжущего (варианты)
RU2303010C2 (ru) * 2004-06-28 2007-07-20 Владислав Аликович Николин Способ получения бинарнопластифицированных портландцементных вяжущих
RU2392242C1 (ru) * 2008-11-05 2010-06-20 Анна Алексеевна Алешковская Способ приготовления гипсоцементнопуццоланового вяжущего

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3038457C2 (de) * 1980-10-11 1983-11-10 L. & C. Steinmüller GmbH, 5270 Gummersbach Verwendung eines Abfallproduktes aus der trockenen Rauchgasentschwefelung für die Herstellung von Flugaschezement
ES2036129B1 (es) * 1991-07-25 1994-04-01 Compania Internacional De Inve Composicion de cemento de alta resistencia mecanica y quimica y procedimiento para su preparacion.
RU2542063C1 (ru) * 2013-10-22 2015-02-20 Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") Тампонажный состав для изоляции зон интенсивного поглощения
CN109795995B (zh) * 2019-04-04 2021-02-05 华东理工大学 一种盐酸法湿法磷酸高效除杂的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB247097A (en) * 1925-08-22 1926-02-11 Martin Lantz Improvements in or relating to the manufacture of cement
GB260447A (en) * 1926-01-04 1926-11-04 Carl Pontoppidan Process for the production of cement mixed with gypsum
FR2184222A5 (en) * 1972-05-12 1973-12-21 Lafarge Ciments Sa Heavy cement compsns - for road foundation and soil consolidation contg a retarden
JPS4913098A (de) * 1972-05-19 1974-02-05

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB247097A (en) * 1925-08-22 1926-02-11 Martin Lantz Improvements in or relating to the manufacture of cement
GB260447A (en) * 1926-01-04 1926-11-04 Carl Pontoppidan Process for the production of cement mixed with gypsum
FR2184222A5 (en) * 1972-05-12 1973-12-21 Lafarge Ciments Sa Heavy cement compsns - for road foundation and soil consolidation contg a retarden
JPS4913098A (de) * 1972-05-19 1974-02-05

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Vol. 80, No. 24, June 17, 1974, page 234, ref. 136847r Columbus, Ohio, US, & JP-A-49 013098 (MITSUI TOATSU CHEMICALS INC.) 05-02-1974. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4335723A1 (de) * 1993-03-27 1994-09-29 Ruedersdorfer Zement Gmbh Verfahren und Vorrichtung zur Herstellung eines Bindemittels
DE19647484A1 (de) * 1996-11-16 1998-05-20 Deutz Ag Verfahren und Anlage zur Herstellung von Zement
RU2243945C2 (ru) * 2003-02-06 2005-01-10 Николин Владислав Аликович Способ получения безусадочного коррозиеустойчивого портландцементного вяжущего (варианты)
RU2303010C2 (ru) * 2004-06-28 2007-07-20 Владислав Аликович Николин Способ получения бинарнопластифицированных портландцементных вяжущих
RU2392242C1 (ru) * 2008-11-05 2010-06-20 Анна Алексеевна Алешковская Способ приготовления гипсоцементнопуццоланового вяжущего

Also Published As

Publication number Publication date
ATE814T1 (de) 1982-04-15
ZA795389B (en) 1980-10-29
DE2962457D1 (en) 1982-05-19
EP0010027B1 (de) 1982-04-07
ES484840A1 (es) 1980-06-16
MA18608A1 (fr) 1980-07-01
GR72527B (de) 1983-11-16
FR2438633A1 (fr) 1980-05-09
BR7906504A (pt) 1980-06-24
FR2438633B1 (de) 1982-04-02

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